Does Rhino create G2 continuity in fillets?

Hi,
I tried to fillet all the edges of a cube using blend edges command but it resulted in G1 continuity when I evaluated it using Zebra. Those 8 corners especially were G1. Alias can fillet with G2 but Rhino 6 cannot.
Why?

How are you determining continuity? Can you post an example ,3dm file?

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Yes, sure. Iā€™m not at home now. I will provide an example when I went home.